1. Featured Articles

    1. Complementary Use of Active Infrared Thermography and Optical Coherent Tomography in Non-destructive Testing Inspection of Ancient Marquetries

      Explore Home - Springer NDE/NDT
      Complementary Use of Active Infrared Thermography and Optical Coherent Tomography in Non-destructive Testing Inspection of Ancient Marquetries

      Imaging-based inspection techniques have practical advantages in the study and/or rehabilitation of artworks. They provide in some cases internal information on the status of the sample to be inspected. On the one hand, techniques based on active infrared thermography (IRT) are advantageous to obtaining complete images of the inspected parts, although a technical interpretation performed by a team of experts in non-destructive testing (NDT) techniques is needed above all when the target is composed, as in our case, by different materials. On the other hand, optical coherence tomography (OCT) is slow when inspecting complete parts, but it has great ...

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    2. Diagnostic accuracy and reproducibility of optical flow ratio for functional evaluation of coronary stenosis in a prospective series

      Explore journals.viamedica.pl Cardiology
      Diagnostic accuracy and reproducibility of optical flow ratio for functional evaluation of coronary stenosis in a prospective series

      Background: Evaluating prospectively the feasibility, accuracy and reproducibility of optical flow ratio (OFR), a novel method of computational physiology based on optical coherence tomography (OCT). Methods and results: Sixty consecutive patients (76 vessels) underwent prospectively OCT, angiography-based quantitative flow ratio (QFR) and fractional flow ratio (FFR). OFR was computed offline in a central core-lab by analysts blinded to FFR. OFR was feasible in 98.7% of the lesions and showed excellent agreement with FFR (ICCa = 0.83, r = 0.83, slope = 0.80, intercept = 0.17, kappa = 0.84). The area under curve to predict an FFR ≤ 0.80 was ...

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      Mentions: Juan Luis Gutiérrez-Chico Shengxian Tu

    3. Full-field optical coherence tomography for the diagnosis of giant cell arteritis

      Explore bioRxiv.org Ophthalmology
      Full-field optical coherence tomography for the diagnosis of giant cell arteritis

      Histopathological examination of temporal artery biopsy (TAB) remains the gold standard for the diagnosis of giant cell arteritis (GCA) but is associated with essential limitations that emphasize the need for an upgraded pathological process. This study pioneered the use of full-field optical coherence tomography (FF-OCT) for rapid and automated on-site pathological diagnosis of GCA. Sixteen TABs (12 negative and 4 positive for GCA) were selected according to major histopathological criteria of GCA following hematoxylin-eosin-saffron-staining for subsequent acquisition with FF-OCT to compare structural modifications of the artery cell wall and thickness of each tunica. Gabor filtering of FF-OCT images was then ...

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      Mentions: Claude Boccara ESPCI ParisTech

    4. Laser-based technique captures 3-D images of impressionist-style brushstrokes

      Explore PhysOrg.com Art
      Laser-based technique captures 3-D images of impressionist-style brushstrokes

      Researchers have developed a new strategy that uses optical coherence tomography (OCT) to acquire both the surface and underlying details of impressionist style oil paintings. This information can be used to create detailed 3-D reconstructions to enhance the viewing experience and offer a way for the visually impaired to experience paintings.

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      Mentions: Yi Yang

    5. Spectral 3D reconstruction of impressionist oil paintings based on macroscopic OCT imaging

      Explore OSA | OSA Publishing
      Spectral 3D reconstruction of impressionist oil paintings based on macroscopic OCT imaging

      Art conservators have adopted optical technologies to improve conservation efforts; laser triangulation, stereophotogrammetry, structured light, laser scanners, and time of flight sensors have been deployed to capture the 3D information of sculptures and architectures. Optical coherence tomography (OCT) has introduced new imaging methods to study the surface features and subsurface structures of delicate cultural heritage objects. However, the field of view of OCT severely limits the scanning area. We present a hybrid scanning platform combined with an effective algorithm for real-time sampling and artifact removal to achieve macroscopic OCT (macro-OCT) imaging and spectral 3D reconstruction of impressionist style oil paintings.

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      Mentions: Yi Yang

    6. Future Directions of Optical Coherence Tomography in Otology: A Morphological and Functional Approach

      Explore e-ceo.org Otolaryngology
      Future Directions of Optical Coherence Tomography in Otology: A Morphological and Functional Approach

      Optical coherence tomography (OCT) is a real-time optical imaging modality that enables tomographic imaging at the submicron scale. Basic research into applications of OCT systems in the field of otology has been conducted. For instance, Oh et al. [1] recently reported that OCT provided noninvasive, nondestructive two-dimensional cross-sectional and three-dimensional volumetric images of middle-ear and inner ear structures in rodents. Anatomical depth-resolved imaging has shown promising potential for morphological measurements of the middle and inner ear in chinchillas [2] and mice with blast trauma [3]. Moreover, OCT has demonstrated its capability as a functional analytical tool by characterizing the vibration ...

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      Mentions: Harvard University Massachusetts Eye and Ear Infirmary Jeong Hun Jang

    7. PhD position on tunable lasers for optical coherence tomography at the University of Kent

      Explore Optical Coherence Tomography News Tunable Sources , Jobs & Studentships
      PhD position on tunable lasers for optical coherence tomography at the University of Kent

      We are recruiting for a PhD Studentship in the fields of Optics and Laser Physics, with emphasis on optical coherence tomography for a period of 36 months starting up to 31 January 2021, within the Applied Optics Group, School of Physical Sciences. This is supported by the Marie Curie Innovative Training Network scheme, 860807, EU funded, jointly organised with 14 other universities, companies and hospitals in Europe. You will spend time at the University of Kent and at the other beneficiaries or associated partners. Supervision will be provided in an European setting where specialized and complementary training will be provided ...

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      Mentions: Adrian G. Podoleanu University of Kent

    8. Perimeter Medical Imaging Receives $7.44 Million CPRIT Grant To Further Develop AI ImgAssist Technology at Leading Cancer Centers in Texas

      Explore Optical Coherence Tomography News Funding , Other Business News
      Perimeter Medical Imaging Receives $7.44 Million CPRIT Grant To Further Develop AI ImgAssist Technology at Leading Cancer Centers in Texas

      Perimeter Medical Imaging , a medical device company, today announces that it has received a $7.44 million grant from CPRIT, a leading state body funding cancer research, to continue developing its artificial intelligence technology that can help surgeons identify if cancer is still present post-tumor removal surgery. The sponsored technology, known as OTIS™, is designed to provide real-time information during breast cancer surgery. The platform’s ability to deliver ultra-high resolution and sub-surface image volumes across the surface of the removed tissue allows surgeons to assess if they have achieved the successful removal of the entire tumor. Should a surgeon ...

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      Mentions: Baylor College of Medicine Perimeter Medical Imaging

    9. Eye in the Sky: Video Game to Improve the Automation of Interpreting OCT Scans for the diagnosis and treatment of AMD

      Explore HuMIn Game Lab Ophthalmology , Other Business News
      Eye in the Sky: Video Game to Improve the Automation of Interpreting OCT Scans for the diagnosis and treatment of AMD

      Optical coherence tomography (OCT) scans can be used to diagnose and evaluate the effectiveness of various treatments and therapies for patients with Age-Related Macular Degeneration (AMD), the leading cause of severe visual impairment in the developed world. While there are treatments for some forms of wet AMD there is nothing to help the vast majority of patients suffering from the dry or degenerative form of AMD. One of the major obstacles in the development of an effective treatment is the inability to detect objective criteria that would either herald further progression of the disease or identify aspects that suggest improvement ...

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    10. See all articles

  2. Recent Articles From Around The Web

    1. Spectral Domain Optical Coherence Tomography Imaging Performance Improvement Based on Field Curvature Aberration-Corrected Spectrometer

      Explore MDPI Open Access Journals Platform
      Spectral Domain Optical Coherence Tomography Imaging Performance Improvement Based on Field Curvature Aberration-Corrected Spectrometer

      We designed and fabricated a telecentric f-theta imaging lens (TFL) to improve the imaging performance of spectral domain optical coherence tomography (SD-OCT). By tailoring the field curvature aberration of the TFL, the flattened focal surface was well matched to the detector plane. Simulation results showed that the spot in the focal plane fitted well within a single pixel and the modulation transfer function at high spatial frequencies showed higher values compared with those of an achromatic doublet imaging lens, which are commonly used in SD-OCT spectrometers. The spectrometer using the TFL had an axial resolution of 7.8 m, which ...

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    2. Pentosan polysulfate maculopathy versus inherited macular dystrophies: comparative assessment with multimodal imaging

      Explore ScienceDirect Ophthalmology
      Pentosan polysulfate maculopathy versus inherited macular dystrophies: comparative assessment with multimodal imaging

      Purpose To evaluate whether pentosan polysulfate maculopathy manifests distinctive characteristics that permit differentiation from hereditary maculopathies with multimodal fundus imaging. Design Retrospective Review Subjects Emory Eye Center databases were queried for the following International Classification of Diseases (ICD) codes between May 20, 2014 through October 22, 2019: 362.70 (unspecified hereditary retinal dystrophy), 362.74 + H35.52 (pigmentary retinal dystrophy), 362.76 +H35.54 (dystrophies primarily involving the retinal pigment epithelium), and H35.50 (unspecified macular degeneration). Methods Fundus images for each patient were evaluated, including color fundus photographs, fundus autofluorescence images, and spectral domain optical coherence tomography images. Cases ...

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      Mentions: Emory University

    3. Spectral domain optical coherence tomography–based prevalence of hydroxychloroquine maculopathy in Indian patients on hydroxychloroquine therapy: A utopia of underdiagnosis

      Explore ScienceDirect Ophthalmology
      Spectral domain optical coherence tomography–based prevalence of hydroxychloroquine maculopathy in Indian patients on hydroxychloroquine therapy: A utopia of underdiagnosis

      Background Spectral domain optical coherence tomography (SD-OCT) detects early structural damage to macula in patients on Hydroxychloroquine (HCQ) therapy. The current screening protocols emphasize concurrent use of both SD-OCT and Visual field analysis (VFA) which detects functional damage to detect Hydroxychloroquine maculopathy. However, VFA is a time-consuming and subjective test which is often neglected. This study gives the prevalence of Hydroxychloroquine maculopathy using SD-OCT alone which often fails to detect macular damage in peri-foveal and extra-foveal area of the retina. Methods Three hundred thirty four eyes of 167 patients taking systemic Hydroxychloroquine were studied with SD-OCT macular cube 512 x ...

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    4. Consistency Between Optical Coherence Tomography and Humphrey Visual Field for Evaluating Glaucomatous Defects in High Myopic Eyes

      Explore Home | Research Square Ophthalmology
      Consistency Between Optical Coherence Tomography and Humphrey Visual Field for Evaluating Glaucomatous Defects in High Myopic Eyes

      Background: The study is to investigate the influence of high myopia on the consistency between optical coherence tomography (OCT) and visual field in primary open-angle glaucoma (POAG). Methods: We enrolled 37 patients with POAG with high myopia (POAG-HM group), 27 patients with POAG without high myopia (POAG group), and 29 controls with high myopia (HM group). All subjects underwent Humphrey perimetry (30-2 and 10-2 algorithms). The peripapillary retinal nerve fiber layer (RNFL) and macular ganglion cell-inner plexiform layer (GCIPL) thicknesses were measured using Cirrus HD-OCT. Spearman’s rank correlation analysis was used to determine correlations between OCT and perimetric parameters ...

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      Mentions: Fudan University Carl Zeiss Meditec Zeiss Cirrus HD-OCT

    5. Tethered capsule en face optical coherence tomography for imaging Barrett’s esophagus in unsedated patients

      Explore arxiv.org Gastroenterology
      Tethered capsule en face optical coherence tomography for imaging Barrett’s esophagus in unsedated patients

      Objective Detection of Barrett’s esophagus (BE) at points of care outside the endoscopy suite may improve screening access and reduce esophageal adenocarcinoma mortality. Tethered capsule optical coherence tomography (OCT) can volumetrically image esophageal mucosa and detect BE in unsedated patients. We investigated ultrahigh-speed tethered capsule, swept-source OCT (SS-OCT) in unsedated patients, improved device design, developed procedural techniques, measured how capsule contact and longitudinal pullback non-uniformity affect coverage, and assessed patient toleration. Design OCT was performed in 16 patients prior to endoscopic surveillance/treatment. Unsedated patients swallowed the capsule with small sips of water and the esophagus imaged by retracting ...

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      Mentions: Massachusetts Institute of Technology James G. Fujimoto Thorlabs

    6. Radial peripapillary capillary density in superior segmental optic hypoplasia measured with OCT angiography

      Explore BMC Ophthalmology Ophthalmology
      Radial peripapillary capillary density in superior segmental optic hypoplasia measured with OCT angiography

      Background To investigate the diagnostic power of radial peripapillary capillary (RPC) density, measured with optical coherence tomography angiography (OCT-A), in patients with superior segmental optic hypoplasia (SSOH). Methods Forty subjects with SSOH and 40 age- and axial length-matched control subjects were retrospectively registered for this study. SSOH was defined as intraocular pressure less than 21 mmHg with the presence of two of the following: superior rim thinning, superior entrance of the central retinal artery, scleral halo, and pale optic disc; as well as non-progressive visual field loss. RPC density was measured with swept-source OCT-A (Triton, Topcon) overall, in the quadrants ...

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      Mentions: Topcon Medical Systems Tohoku University

    7. Interobserver reproducibility and interocular symmetry of the macular ganglion cell complex: assessment in healthy children using optical coherence tomography

      Explore BMC Ophthalmology Ophthalmology
      Interobserver reproducibility and interocular symmetry of the macular ganglion cell complex: assessment in healthy children using optical coherence tomography

      Background Assessment of interobserver reproducibility and interocular symmetry using optical coherence tomography (OCT)–based measurements of the macular ganglion cell complex (GCC) in healthy children facilitates interpretation of OCT data. We assessed the interobserver reproducibility and interocular symmetry of GCC and evaluated candidate determinants. Methods This was a cross-sectional study performed in a primary and tertiary health-care setting. A total of 126 healthy participants aged 5 to 18 years were eligible. GCC scans were performed by 4 operators using the Topcon 3D OCT-2000 device. Intraclass correlation coefficients (ICCs) were used to estimate reproducibility and symmetry. Cut-off points for symmetry were ...

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      Mentions: Topcon Medical Systems Topcon 3D OCT-2000

    8. Evaluation of Neurodegenerative and Inflammatory Processes in Temporomandibular Joint Disorders Using Optical Coherence Tomography

      Explore ScienceDirect Dentistry
      Evaluation of Neurodegenerative and Inflammatory Processes in Temporomandibular Joint Disorders Using Optical Coherence Tomography

      Introduction: Temporomandibular joint disorders (TMD) is a process with systemic effects rather than local effects. The purpose of this study is to examine the retinal layer structure using optical coherence tomography (OCT) method in order to detect possible degenerative and inflammatory process in patients with TMD. Material and Methods: 35 healthy controls and 34 TMD patients were evaluated bilaterally in this study. The retinal nerve fiber layer (RNFL), ganglion cell layer (GCL), inner plexiform layer (IPL) and choroidal thickness were analyzed using OCT. Results: When TMD patients were compared with healthy controls, GCL and IPL volumes and RNFL thickness decreased ...

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    9. Systems and methods for eye tracking for motion corrected ophthalmic optical coherence tomography

      Explore uspto.gov Ophthalmology , Patents
      Systems and methods for eye tracking for motion corrected ophthalmic optical coherence tomography

      Systems and methods for eye tracking for motion corrected ophthalmic optical coherence tomography (OCT) are disclosed. According to an aspect, an imaging system includes an eye tracking device configured to determine movement of an eye. The imaging system also includes an OCT apparatus configured to generate OCT images of a retina of the eye. The OCT apparatus includes a scanner operable to be moved for relocating an OCT scan pivot at a pupil plane for image capture and during capture of the OCT images. The imaging system also includes a controller configured to control the scanner to relocate the OCT ...

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      Mentions: Joseph A. Izatt Duke University Oscar Carrasco-Zevallos

    10. Linear sensor for a spectroscopic optical coherence tomography imaging apparatus

      Explore uspto.gov Patents
      Linear sensor for a spectroscopic optical coherence tomography imaging apparatus

      The invention provides a linear sensor including a row 100 of N regularly spaced pixels that are formed in a semiconductor substrate, and a circuit for reading out the N pixels, which delivers an output signal for each of the N pixels of the row, characterized in that the N pixels comprise image-capturing pixels that have a useful photosensitive area in the shape of a rectangle R that is higher than it is wide, where the width is in the direction of the row and the height is in the perpendicular direction, and at least two spaced-apart pairs of alignment-detecting ...

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    11. Systems and methods for optimizing focus for imaging-based overlay metrology

      Explore uspto.gov Patents
      Systems and methods for optimizing focus for imaging-based overlay metrology

      Methods and systems for focusing and measuring by mean of an interferometer device, having an optical coherence tomography (OCT) focusing system, by separately directing an overlapped measurement and reference wavefront towards a focus sensor and towards an imaging sensor; where a predefined focusing illumination spectrum of the overlapped wavefront is directed towards the focus sensor, and where a predefined measurement illumination spectrum of the overlapped wavefront is directed towards the imaging sensor. Methods and systems for maintaining focus of an interferometer device, having an OCT focusing system, during sample's stage moves.

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    12. Full-field optical coherence tomography: novel imaging technique for extemporaneous high-resolution analysis of mucosal architecture in human gut biopsies

      Explore Gut - BMJ Journals Gastroenterology
      Full-field optical coherence tomography: novel imaging technique for extemporaneous high-resolution analysis of mucosal architecture in human gut biopsies

      Full-field optical coherence tomography (FFOCT) is an imaging technique of biological tissue based on tissue light reflectance analysis. We evaluated the feasibility of imaging fresh digestive mucosal biopsies after a quick mounting procedure (5 min) using two distinct modalities of FFOCT. In static FFOCT mode, we gained high-resolution images of general gut tissue-specific architecture, such as oesophageal papillae, gastric pits, duodenal villi and colonic crypts. In dynamic FFOCT mode, we imaged individual epithelial cells of the mucosal lining with a cellular or subcellular resolution and identified cellular components of the lamina propria. FFOCT represents a promising dye-free imaging tool for ...

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      Mentions: Claude Boccara Michalina J. Góra LLTech

    13. Simon Poole, Cylite co-founder, elected as Fellow of Australian Academy of Science

      Explore Optical Coherence Tomography News
      Simon Poole, Cylite co-founder, elected as Fellow of Australian Academy of Science

      Recognised for achievements in Photonics and his role in the development of an export-competitive photonics industry in Australia Melbourne, Australia, May 25, 2020 – Cylite Pty Ltd, a company developing the next generation of diagnostic OCT systems for Ophthalmology and Optometry, is delighted to announce Dr Simon Poole AO, one of Cylite’s co-founders and VP Business Development, has been elected as a Fellow of the Australian Academy of Science. Dr Poole is one of 24 new Fellows elected each year to the Academy. The citation for his election reads as follows: Simon Poole is an outstanding researcher and entrepreneur in ...

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      Mentions: Cylite

    14. Femtosecond Optical Tomography

      Explore Metrology and instruments
      Femtosecond Optical Tomography

      The aim of the work is development of medical optical tomo­graphy technologies. The physical principles, tasks, and boundary possibilities of the optical tomography systems are considered. The authors propose to use the femtosecond lasers, operating in the «optical comb» mode, as a light source in optical tomography system. The advantages of this source uses were analyzed and reso­lution power of femtosecond optical homographs was calculated in the article.

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    15. Influence of neoatherosclerosis on prognosis and treatment response in patients with in-stent restenosis

      Explore revespcardiol.org Cardiology
      Influence of neoatherosclerosis on prognosis and treatment response in patients with in-stent restenosis

      Introduction and objectives Neoatherosclerosis is one of the causes of in-stent restenosis (ISR). Our objective was to evaluate the influence of neoatherosclerosis on prognosis and treatment response in patients with ISR. Methods This is a pooled analysis of the optical coherence tomography (OCT)-substudies of 2 multicenter, randomized clinical trials, RIBS IV and V, comparing treatment with paclitaxel-coated balloon vs everolimus-eluting stent in patients with ISR. OCT evaluation was performed at baseline and at 6 to 9 months. Neoatherosclerosis was defined in baseline OCT as neointima with calcified or lipid content. We evaluated the angiographic and OCT results at 6 ...

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      Mentions: Fernando Alfonso Nieves Gonzalo Santiago Jiménez-Valero
      16. See all articles
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  6. Organizations in the News

    1. (2 articles) UCLA
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    3. (2 articles) ESPCI ParisTech
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    1. (2 articles) Srinivas R. Sadda
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    1. (3 articles) Carl Zeiss Meditec
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  9. Picture Gallery

    Complementary Use of Active Infrared Thermography and Optical Coherent Tomography in Non-destructive Testing Inspection of Ancient Marquetries Diagnostic accuracy and reproducibility of optical flow ratio for functional evaluation of coronary stenosis in a prospective series Full-field optical coherence tomography for the diagnosis of giant cell arteritis Laser-based technique captures 3-D images of impressionist-style brushstrokes Spectral 3D reconstruction of impressionist oil paintings based on macroscopic OCT imaging Future Directions of Optical Coherence Tomography in Otology: A Morphological and Functional Approach PhD position on tunable lasers for optical coherence tomography at the University of Kent Perimeter Medical Imaging Receives $7.44 Million CPRIT Grant To Further Develop AI ImgAssist Technology at Leading Cancer Centers in Texas Eye in the Sky: Video Game to Improve the Automation of Interpreting OCT Scans for the diagnosis and treatment of AMD Spectral Domain Optical Coherence Tomography Imaging Performance Improvement Based on Field Curvature Aberration-Corrected Spectrometer Pentosan polysulfate maculopathy versus inherited macular dystrophies: comparative assessment with multimodal imaging Spectral domain optical coherence tomography–based prevalence of hydroxychloroquine maculopathy in Indian patients on hydroxychloroquine therapy: A utopia of underdiagnosis

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    1. Previous research has seen a thinning of the retina in Alzheimer's patients, but by adding a light-scattering technique to the measurement, we've found that the retinal nerve fiber layer is also rougher and more disordered...Our hope is that we can use this insight to create an easy and cheap screening device that wouldn't only be available at your doctor's office, but at places like your local pharmacy as well
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    2. Despite living in the 'digital age,' surgeons must routinely rely on their eyesight and sense of touch to determine if they have removed the entire tumor during breast-conserving surgery...Due to lack of adequate tools, 20 to 30 percent of patients must return for additional surgery, resulting in substantial physical and financial burdens and increased risk of complications.
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